The answer is 420 months

Because 1 year = 12 months

So 35 years = 35\(\times\)12=420 (months)

So 35 years have 420 months

We have : x-1=0

So (x-1)(mx+2)=0 with any value of mx+2

So (x-1)(mx+2)=0 with any value of m

So the answer is all the value of m

It will take her :

480\(\times\)600=288000 (minutes)

Change : 288000 minutes =4800 hours

So the answer is : 4800 hours